The diagram represents a plant cell. The cell has been stained using iodine solution. Once stained with iodine solution, what colours are shown by the cell wall and the starch grain?
- Acell wall: blue-black; starch grain: blue-black
- Bcell wall: blue-black; starch grain: orange-brown
- Ccell wall: orange-brown; starch grain: blue-black
- Dcell wall: orange-brown; starch grain: orange-brown